Im having a problem with my 2003 Altima 3.5 SE. It seems that I had an alternator go out. At the same time my A/C, Heater blower motor is now stuck on hi. No matter if I turn it off, it still runs on hi. FYI, this is equipped with the automatic temp controll unit. Could this be the Blwer Motor resister? I need to know before I spend the money.
I would prob replace the controller unit its extremly easy to take out. the plastic surrounding it pops off and then remove the screws holding it in and unplug it. you can prob find one for pretty cheap on ebay or check your local junk yard that has the newer imports. im sure the controll unit went bad when the alt was replaced
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I believe that these are two separate problims. The Heater fan stops working because the blower motor resistor block is bad. This is a common problem on the 03 Grand Prix. You'll need to remove the blower and replace the resistor block. The blower is under the center of the drivers onsole.
I've had mice in my Nissan PU and actually caught one in a trap set on the floorboard; so I know they can get inside. They also knocked some of the fiberglass insulation into the blower motor so it vibrated as it was no longer balanced. You could have a dead one in your blower. Mine was easily accessible from under the passenger side under the dash. Three screws and the motor dropped so I could clean out the fiberglass.
On your Vehicle the problem for the FAN speed is NOT the FAN switch.
99.9 % of this problem on cars is the BLOWER MOTOR RESISTOR.
The blower motor resistor give the speed to the Fan.
But on High speed the switch make a By pass of the switch using a Relay for the high speed.
The Blower motor resistor, is located Beside of the Blower motor On the passanger compartment.
If you replace the blower motor resistor you have 99.9% of this will solve your problem.
I'm a Mechanic.
I hope this help on your problem.
Thank you for use fixya...